Wizard: Starting from Bloodline Fusion

Luo Rui traveled to another world and became the son of a nobleman, gaining the ability to devour and fuse blood. By fusing the blood of living creatures, you can improve your own attributes and awaken your natural abilities. As a knight No matter what grudge combat skills, as long as my fused bloodline is strong enough, I will be a monster with average A value. As a wizard What kind of bloodline transformation spell will backfire, and I can only choose one series of enhanced transformations? I don't care at all. What blood sacrifice is taboo? Isn't it okay if I sacrifice my own blood?